单项选择题
Which of the followings will affect the spray of fuel oil?（）
A.coke deposits B.cylinder water temperature C.asphalt in fuel oil D.lub oil
单项选择题 When the direction handle of telegraph is moved, the relative position of camshaft and crankshaft will be（）
单项选择题 Which one of the followings may not be checked before engine starting?（）
单项选择题 The is employed to warm up a large diesel engine before its starting（）
